Wells & water/ CALCULATOR
Estimate daily use and an explicit buffer-storage volume.
FROM ESTIMATE TO ACTION
Record meter readings, elapsed days and occupancy. Convert m³ to litres before dividing: 4.2 m³ over 7 days for 4 residents gives 150 L per resident per day. This is an illustrative example, not a consumption standard; check seasonal use and guests separately.
Irrigation or backwash already included in the measured per-resident figure must not be added again. Separate these uses first, or leave additional daily use at zero. With 4 × 150 plus 100 L/day genuinely additional use, the model gives 700 L/day and 1400 L usable storage for 2 days.
The selected days multiply the same daily demand, without allowing for refill or changing occupancy. The result is usable water volume, not a tank nameplate capacity. Peak simultaneous flow, unavailable bottom water, refill balance, water quality and turnover require separate checks; this is not an emergency drinking-water recommendation.